Historical Marker
Henry R. Pattengill
Historical marker location:
171 West Center Street, Ithaca, Michigan
( Marker is at the intersection of West Center Street and North Maple Street, on the right when traveling west on West Center Street.)
Marker installed: 2011
Michigan is the only state to have two designated "state stones": the Petoskey Stone, which is the state stone of Michigan, and the Isle Royale Greenstone, which is the state gemstone of Michigan. The Petoskey Stone is a fossilized coral that is found primarily in the northern Lower Peninsula, while the Isle Royale Greenstone is a rare mineral found only on Isle Royale in Lake Superior.